Igniter for gas.



No. '689,I03. Patented Dec. l7, I901. 1 A. MARTINI.

- IGNITER FOB GAS.

(Application fllad mm. as, 1901.

(N0 Model.)

[lire/21%)? ill/26.5.9 as

Ma r/Zn I UNITED STATES PATENT OFFICE.

ADOLF MARTINI, OF BERLIN, GERMANY.

lGNlTER FOR GAS.

SPECIFICATION forming part of Letters latent No. 689,103, dated December 17, 1901.

Application filed January 28, 1901. Serial No. 45,088. (No model.)

To aZZ whom it may concern:

Be it known that I, ADOLF MARTINI, a citizen of the Kingdom of Prussia, and a resident of Berlin, Germany, (whose post-oifice address is Leipzigerstrasse 111,) have invented certain new and useful Improvements in Igniters for Gas, of which the following is a specification.

The object of my present invention is an improved igniter for gas. It is a generally known fact that the ignition takes place only if the jet of gas is mixed with sufficient oxygen or atmospheric air when impinging on the platinum pill. It is also known that the ignition sooner takes place when the pill is suspended in such a way as to freely oscillate when in contact with the jet of gas and air.

By careful observation I have found that the ignition takes place with greater rapidity if the pressure of the gas is suddenly increased and if a heated and compressed mixture of gas and air comes into contact with the glowing ignition-pill. This fact has not been known and not been made use of, for, on the contrary, care has been taken in difierent known constructions-for example, in United States Patent No. 625,344=-to give the gas a free passage around the pill. I

The accompanying drawings show the present invention, and reference will be had to them in the following specification.

Figure 1 shows the new igniter in elevation, and Fig. 2 is a vertical section through same.

To the downward-curved end of an arm a, which by means of a socket b may be fixed to a rod, is fastened a bell-shaped metal cup 0. In its cavity is suspended by proper means an ignition-pill d, so as to be able to freely oscillate. This pill is provided in the generally known manner with wires of platinum and palladium. To the edge of 0 may be fastened a ring e, imitating the form of an inverted funnel, having perforated walls. Its under side may be closed by means of a vaulted cap f, made of a screen of metallic wires.

The device acts as follows: The jet of gas, which has been already mixed with sufficient atmospheric air, enters the cavity of the cap 0, from which there is no escape besides through the lower opening. Its contact with the ignition-pill d causes the heating of the latter, and the higher temperature is communicated to the surrounded gas, which consequently tends to expand; but the jet of fresh gas impinging on this dilated mixture in the cap 0 opposes resistance to the expansion and, on the contrary, causes a slight compression, and in this heated and compressed mixture surrounding the pill the ignition takes place more rapidly.

What I claim is- In combination a bell-shaped cup, having solid walls and'an ignitionpill containing finely-divided platinum suspended in the cavity of said cup so as to be able to freely oscillate, substantially as and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

ADOLF MARTINI.

W'itnesses:

WOLDEMAR HAUPT, HENRY HASPER. 

